Switch for automatic telephone systems.



Wx KAISLING. SWITCH FOR AUTOMATIC TELEPHONE SYSTEMS.

4 APPLICATION FILED APH. 2l, 1910. 1,215,814.

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W. KAISLING. SWITCH FOR AUTOMATIC TELEPHONE SYSTEMS.

APPLICATION FILED APR.2I.19IO. 1,215,81 4. wenn@ Fb.13,1917.

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JM/:4 La* E ENEL-neg w. KAISLING. SWITCH FOR AUTOMATIC TELEPHONE SYSTEMS.

AIPLICATION FILED APH. 27. 1910. 1,215,814.

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Patented Feb. 13, 1917.

UNITED STATES PATENT OFFICE.

WILLIAM KAISLING, OF CHICAGO, ILLINOIS, ASSIGNOR 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AND SUPPLY COMPANY,

SWITCH FOB AUTOMATIC TO KELLOGG SWITCHBOABD TELEPHONE SYSTEMS.

Patented Feb. 13, 1917.

Application filed April 27, 1910. Serial No. 558,000.

T 0 all whom t may concern.'

Be it known that I, VVrLLrAiir KAisLrNG, a citizen of the United States, residing in Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Switches for Automatic Telephone Systems, of which the following is a specification.

My invention relates to selective switches for automatic telephone exchange systems and more particularly to that type known as selector or connector switches in which movable contacts or cooperate with bank contacts, and in which the wipers are given a so-called primary adjustment to select a bank, group or row of contacts and thereafter given a so-called secondary adjustment to connect with a Contact in a bank, group or row.

The object of my invention is to provide a switch of the type above referred to which is efficient in operation, simple, cheap and of an improved construction.

The switch of my invention is capable of other uses than that referred to above, and

. I have elected to illustrate and describe the same as employed for the purpose of a connector for automatic telephone exchange systems, although it is also adapted for use as a first or second selector.

Referring to the accompanying drawings, Figure 1 is a front elevation of the switch; Fig. 2 shows the springs which are broken away from the bottom part of Fig. 1; Fig. 3 is a section along the line 3-3 of Fig. 1; Fig. 4 is a partial plan view of some of the cooperating parts of Fig. 1 Fig. 5 shows the ratchets with their interlocking pawls which are shown at the left end of the hori- Zontal shaft of Fig. 1; Fig. 6 is aview of one-half of the escapement mechanism shown at the top of the vertical shaft of Fig. 1; Fig. 7 shows the method of fastening the spring which is inside of the drum at the right end of the horizontal shaft, and a similar one at the bottom of the vertical shaft; Fig. 8 is a transverse section along the line 8-8 of Fig. 1, but with the wipers moved off-normal; Fig. 9 shows the primary off-normal springs shown at the left of the horizontal shaft in Fig. 1; Fig. 10 is a plan view of the auxiliary switch O shown at the top of Fig. 1, and Fig. 11 is wipers are arranged to' systems. is provided to open a diagrammatic circuit for more fully explaining the operation of the switch.

It is believed by first describing the operation of the circuit shown in Fig. 11, the operation of the switch-mechanism will be more fully understood.

The switch includes the so-called private wiper 31 and the two line wipers 29 and 30 adapted to cooperate with a number of banks or groups of contacts 25, Q3 and 24. The wipers are first given a so'-called primary adjustment to select a group of contacts, this primary adjustment being controlled by a primary shaft and its associated primary magnet PM. The wipers are then given a so-called secondary adjustment to connect with a contact in the selected group, this secondary adjustment being controlled by a secondary shaft and its associated secondary magnet SM.

The primary off-normal springs PON are controlled by the primary shaft, being moved to their alternate position upon the first off-normal movement of the primary shaft, and restored to normal upon the return of the shaft to normal.

The secondaryoff-normal springs SON are controlled by the secondary shaft in a manner similar to the primary off-normal springs.

The secondary release magnet SRM controls the release of the wipers 31. 29 and S0 from their secondary movement and the primary release magnet PRM controls the release of the wipers 31. Q9`and 30 from their primary movement.

The release. relay RR. which is a slow acting relay and as such diagrannnatically illustrated, is provided to control the operation of the release magnets PBM and SRM. The dial D corresponding to the dial used on calling devices for automatic telephone and close the circuitof the relay lR which controls the movements of the wipers.

Referring now to Fig. 11. the switch S corresponding to the subscribers switchhook is closed and an energizing circuit for the relay PR is closed from ground through the upper winding of relay PR. switch S, contact of the dial spring 2 and the lower winding of the relay PR to battery. The release relay RR is now energized from a circuit traced from battery through the winding of the relay RR to ground at alternate contact 1 of relay PR. The dial D is now operated in a clockwise direction to bring a number of the teeth on the periphery thereof below the contact spring The dial is then released and is returned by the spring shown thereon, opening and closing the contact at the spring 2. The relay PR is thereby de'e'nergized and energized, at each break of the circuit by the teeth upon the dial, operating the primary magnet PM over a circuit traced from battery through the winding of the magnet PM, normal contact 3 of the secondary off-normal switch, normal contact 4 of relay A, alternate contact 5 of relay RR to ground at normal contact 1 of relay PR. For each denergization of the relay PR an impulse is sent through the primary vmagnet, operating the said primary magnet to step the wipers 31, 29 and 30 to select a row, of contacts. Upon the Erst denergization of the relay PR the impulse from the ground at normal contact l is divided at a point above the primary magnet PM, part of the impulse passing through the sluggish relay 6 which attracts its armature and holds thel contact 7 open while the primary magnet is operating. After the last opening of the contact at the spring 2, the primary relay PR remains energized long enough for the relay to detract its armature` closing the normal contact 7, and a circuit is now traced from the ground at alternate contact S of relay RR, normal contact 7, secondary off-normal contact 9, alternate contact 10 of the primary off-normal switch PON which closed upon the first primary step of the wipers through the winding of the sluggish relay A to battery, energizing the said relay A and moving the contact 4f to its alternateposition, but at this time the contact 1 of the relay PR being in its alternate position, nothing else happens.

rlhc dial l) is now operated again to open and close the contact of spring 2 to transmit another set of impulses from the ground at normal contact l` through alternate contact 5 of' relay RR, alternate contact Jr, through the winding of the secondary relay Shi to battery, energizing and denergizing said relay SR for each impulse sent from the ground at4 contact l. Upon each energization ot' the secondary relay Sli. the seconda ry magnet SM is operated to step the wipers 31, 20 and 30 to connect with -a contact in the selected row.' llpon the first secondary movement of' the wipers 31, 29 and 30 the contact springs 3 and of the secondary offnormal switch SONf are moved to their alternate position. the contact t) opening the circuit for the relay A. but the said, relay being sluggish, it retains its armature attracted due to the impulses from the ground at the alternate Contact 11 of the secondary relay SR and remains energized while the said contact 11 is vibrating. After the last impulse has been sent through the secondary relay SR from the ground at normal contact l. the said secondary relay Sli is deencrgized and the relay again detractsdts armatl'lre moving the Assuming that the switch is being used as a connector in an automatic telephone system, and that the wipers 31, 2S) and il() have connected to a party line of four subscribers, the next step is to ring the bell of the subscriber desired. For this purpose I provide the switch O with its associated magnet 86. Assuming that there are four telephones on the line of the called subscriber, and that the well known harmonic system of ringing is used, the next step is to pick out the proper frequency. The dial at D is operated once more to vibrate the, contact 1 of the relay PR, the proper number of impulses are transmitted from the ground at the normal contact 1 through alternate Contact 5, normal contact l, alternate contact 3 of the secondary off-normal switch, and then dividing, part passing through the winding of magnet 8G and part through the winding of magnet N to battery, energizing' and deenergizing the magnet N to step the wiper 72 to connect to the proper contactl T3, which is connected to a generator of the proper frequency to ring the bell of the desired subscriber on the line. The shaft SS which is the shaft controlling the secondary movement of the wipers 31, 2f) and 550 having moved upon the first secondary step of the said wipers.o the retaining paw-l 80 moves into engagement with the teeth of the ratchet wheel 76 due to the pin 82 being moved away from the retaining pawl 80. Thus, when the magnet 8G is operated to step the wiper 72 to select a contact 73, the retaining pawl 80 through its engaging ratchet 76 holds the wiper 72 in engagement with its selected contact. The relay N being sluggish, retains its armature in an attractedposition while the last set of impulses are being transmitted through the said relay and magnet F36, holding` the contact 16 open until the proper frequency of ringing current has been selected.

lo release the connector switch sociated mechanism, the switch S .is opened, allowing the relay PR to denergize and opening the circuit through the release relay RR at contact 1 and closing a circuit for the secondary release magnet SRM from ground at normal contact 8 through alternate contact 17 of primary off-normal switch, through the winding of the secondary release magnet SRM to the alternating current generator.

rcuit is also closed from the ground at normal contact 8 through the alternate conand its ascontact vl to its normal position.l

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tact 15 of the primary off-normal switch, through the winding of the primary release magnet'PRM to battery energizing the said magnet.

The closing of the circuit through the secondary release magnet SRM results in its armature being vibrated and stepping the secondary shaft to its normaLposition. the said shaft restoring the wipers 31, 29 and 30 from their secondary movement.v

The primary release magnet has upon its energization,withdra wn the retaining pawl from its engagement with a ratchet on the primary shaft so that when the 'wipers 31, 29 and 30 have been restored from their secondary movement, the primary shaft automatically restores them from their primary movement.

y The secondary off-normal switch SON and the primary off-normal switch POBT have been restored to their normal position upon the return of their respective associated shafts.

Upon the opening of the contacts 15 and 17 of the primary off-normal switch, the circuit through the release magnets is opened and they remain inert. Upon therestoration of the wipers 31. 29 and 30 to their second ary normal position, and the restoration of the secondary shaft SS. the arm 3'2` which is secured to the said secondary shaft SS, engaging the pawl SO moves it out of engagement with the ratchet vTG. allowing the wiper T2 to restore. The switch with all of its associated mechanism is now again at normal.

Referring now to the switch mechanism, in Fig. 1 is shown the frame Q0 with the bank contacts arranged as shown in the large opening at the bottom of the frame, the banks being mounted between two rearwardly extending parts of the frame '2l and 22. as shown in Fig. 4. ln Fig. 1. l have represented the contacts by single lines. as to show the contacts as they really appear would complicate the drawing unnecessarily. The bank contacts and Q4 are known as the line contacts. while the bank contacts 25 are known as the private bank contacts. the line contacts scrvingto conduct the talking strands and the private contact associated wiper usually controllinglthe connecting with a certain set of contacts.

Each bank includes the two strips 26 and 27 as shown in Fig. 4 having the contacts clamped between them by the screws QS. cach bank being adjustably held between thepieces 21 andl 22 by the screws 21 and '22. The line wipers 29 and 30 are adapted to cooperate with the bank contacts 23 and Q4, while the private wiper 31 is adapted to copcrate with the private contacts Q5. The said wipers are secured to the sleeve 32 which fits loosely about the primary shaft 65 PS. Secured to the face of the mounting and its. bottom of the shaft SS is a plate 20 is the primary magnet PM which is adapted when energized to attract its armature 33 bringing its pawl 34 in engagement with the teeth of the ratchet 35 as shown in Fig. 8. l

The ratchet wheel 35 is secured to the primary shaft PS and has a slotted opening 36 as shown in Fig. 5. Projecting to the left of the wipers 29, is the catch bar 3T shown in Figs. 4 and 5, the said catch bar being fastened to sleeve and normally projecting through the slot 3G of ratchet so that when the ratchet 35 is rotated by the operation of the primary magnet PM, the wipers are rotated to a point opposite a row or bank of contacts. The pawl 39 Fig. is pivotally secured to the ratchet -wheel 35 and has the spring 40 Fig. 8 pressing against the tail ofthe pawl. Fastened to the frame is the stationary ratchet 41 through which the shaft PS rotates and having a number of teeth adapted to be engaged by the retaining pawl 39, as will be explained later on. Then the wipers are at normal as shown in Fig. 1, and the catch bar 37 is in the slot 36. the cam 37 holds the retaining pawl 39 out of engagement with the teeth of the stationary ratchet 41.

The primary shaft PS is journaled in the forwardly extending brackets 4Q and 43 of the frame Q0 and mounted on the, right end is the ratchet drum 44 which is loose on the shaft PS and having one end of the spring 45,'Fig. 7 secured to the said drum by means of the pin 46, while the other end of the spring 45 is fastened to the shaft PS. The check pawl 47 is normally in engagement with the teeth of the ratchet 44 so that by rotating the ratchet 44 in either direction, the tension of the spring 45 may be increased or decreased as desired. The tension ofthe spring 45 tends to rotate-the shaft PS in a reverse clockwise direction. but the arm 49 which is fastened to the shaft PS by the screw 50 as shown in Fig. 4, normally rests against the pin 51 preventing this.

The secondary shaft SS is journaled in the forwardly extending brackets 52 and 53 which are riveted to the frame 20. At the drum ratchet. 54 loosely mounted thereon and having a spring and ratchet arrangement similar to that shown in Fig. T. so the tension of the spring for the secondary shaft SS may be adjusted in a manner similar to that of the primary `shaft PS. F astened to the middle of the shaft SS is the pinion 55 which engagesthe teeth of the rack on the sleeve 32, so that when the shaft SS is rotated. the pinion engages the teeth on the sleeve 3Q anil moves the wipers '29, 30 and 31 along the shaft PS.

At the top of the shaft escapemcnt wheels 56 and SS is mounted the 57 cooperating 32 by the screws 38,

ythe"pallet 59 in t'ront of The shaft SS is now 'with the respective pallets 5S and 5.() which are riveted to the arn'iature (if) ot' the secondary magnet SM. Referring now to the eseapement mechanism. the escapement wheel .3U is fastened to the sha't't SS b y the screw il and the eseapenient wheel 57 is loose on shaft SS. The pallet 5S normally engages la tooth ot the wheel 5G and as the wheel is secured to the shaft SS and the shaft SS is normally under tension of the spring in the tdrum 5l. the said shaft is prevented from being rotated bv the said spring until the magnet SM is operated. The pin G2 driven into the wheel 5G projects up through the slot (i3 of the wheel 57 and supports one end of the spring (i3 while the other end ot thc spring is held b v the pin G4 which is driven into the upper wheel 57. The spring 63 tends to draw the pins (S2 and 64 toward each other. and the pin (52 being in the tastened wheel 56. the upper wheel 57 is held undfer the tension ot the spring G8 with the end ot the slot (S2- against the pin 62. The operation ot' the escapement mechanism is as., follows: The secondary magnet SM be,- ing energized. the armature 60 is attracted. moving the pallet 5S out of engagement with the tooth of the wheel 56 and moving the tooth 57 of theupper wheel 57. rotated in a clockwise direction byy the spring in drum 54 until the tooth 57 strikes the pallet 59. but as the spring in thedrum 54 is strong enough to overcome the spring (3R-in the wheel 56. the shaft SS and wheel '56. which is secured to the shaft continues to move until the pin (32 reaches the other end of the slot (i3 which acts as a stop tor the shaftSS. The armature of the magnet SM is now retracted and moves the pallet 59 out of" engagement with the tooth 57, but the pallet 58 engages the tooth of wheel 5ft which is now adjacent to it. before the pallet 59 has disengaged from the toothv 57. allowing the upper wheel 57 to again advance a half step ahead of the lower wheel 5G due to the action of the spring G3. The pinion 55 being secured to the Shaft SS and engaging' the rack on the sleeve tor the first step ot the magnet SM. the sleeve is moved along the shaft FS carrying the wipers to the first set of contacts and tor each step thereafter to the next set ot' contacts. llpon the first secondarv step ot' the wipers Q9. 30 and 3l. the catch bar 37 is moved out ot engagement with the slot 3f; and the cam 37 now allows the retaining pawl 39 to engagea tooth of the stationary ratchet 4l. By having the said pawl engage the ratchet 41. in withdrawing .the pawl 48 from the ratchet when releasing the switch. the rotary tension is held ofi1 the Iwipers inl restoring over the contacts until the wipers have disengaged from the contacts as will be more fully explained.

The primary off-normal springs PON shown in Figs. l and 9 are moved to their alternate position of the shat't PS. Secured to the lett end ot' the shaft PS is the cam (35 with the insulation stud (36 riveted to the end thereof. This stud normally rests against the spring (S7 and when the shaft PS'is rotated ott-normal the stud (5G moves away trom the spring 67 allowing it and its connected spring to move to their alternate position.

The secondary oli'normal springs SON shown in Fig. l aie moved to their alternate position upon the first movement ot the seeondary shaft SS. Fastcned to the shaft SS is the collar (3S having an arm (39 with the stud riveted to the farther end thereof. lpon the first oft-normal movement of the shat't SS. the stud 70 is moved away from the spring 7l, allowing it and its connectw ing spring to moveto their alternate position.

contacts 73. The wipers 72 are clamped to. tthe nut 75 and also secured to shat't 74 by the shaft 7l. is the ratchet wheel 7f3. The pawl 77 is fastened to the armature 7S and is normally out ot 'engagement with the ratchet 7G. due to the said pawl resting against the stop 79 as shown in Fig. 10. The retaining pawl 80 is normally out ot' engagement with the ratchet 7G, but upon the first movement otl the shaft SS oft normal, the arm Sl which is secured to the shaft SS, moves the\pin Si) out ot eiigagement with the arm S3 ot the retaining pawl 8() allowing the pawl SO to engage the ratchet wheel 7f3. The shaft 74 has secured to its lower -end a ratchet drum and spring arrangement 84 which is similar to that shown in Fig. 7. This tends to hold the shaft 74 with its wipers 72 under tension, with the ratchet wheel 7G resting against the stop pin 85. lVhen the magnet 86 is energized. the arma ture 78 is attracted and the pawl 77 engages a tooth ot theratchet wheel 7G, moving the wipers 72 to engage the first contact 73 in the row. For cach actuation ot the magnet SG the wipers are advanced one step'. The wipers now remain in engagement with the selected Contact until the shaft SS is'restored. when the `pin 82 again engages the arm 83 ot the retaining pawl 80. withdraw-' the ratchet' For restoring the wipers trom their secupon the first movement Mounted at the top end of the mounting ondary movement, the secondary release magnet SRM is operated. The said magnet is fastened to the mounting ,plate 20 as shown in Fig. 3 yand has having the pawl 88 pivotally secured' thereto and normally held against the adjustable screw stop S9 by the spring 90. The ratchet wheel 91 is secured to the secondary shaft SS and is rotated by the operation of the pawl 88.

The primary release magnet PRM Fig. 3, is fastened to the mounting plate 20 and has the armature 92 pivotally secured thereto and held under tension against the adjustable screw-stop 93 by the adjustable spring 92. Pivotally secured to the armature 92 is the plunger 91 which normally is out of engagement with the springs 95 and 96 shown in Figs. 3 and 2. lVhen the magnet PRM is energized, the armature 92 is attracted forcing the plunger 94 between the springs 95 and 96 and .noving them and the associated spring to their alternate position. The spring retaining pawl 97 fastened to the armature 92 by the screw 98, engages the teeth of the ratchet wheel' 91 when the armature 92 is attracted by the magnet PBM during the release of the wipers.

Secured to the armature 92 of the primary release magnet PRM is the release' arm 99 as shown in Fig. 8. lVhen the magnet PBM is energized, the arm 99 engages the retaining pawl -18 moving the saifl pawl out of engagement with the ratchet wheel 35, allow- 29, 30 and 31 to restore from 'ng t'he wipers their primary movement 'at the proper time. Release of switch mechanism.-

Assuming the wipers 29, 30 and 31 have been moved to select a row or bank of contacts and then connected with a set of contacts in the selected row, the restoration of the wipers and associated mechanism to normal will now be described.

To release the switch the magnets PRM and SRM are energized, the magnet PRM being energized by a direct current and the magnet SRM by alternating or an interrupted current. Although upon the energization of the primary release magnet PBM the retaining pawl 48 is disengaged from the ratchet 35, the rotary strainl on the primary shaft PS does not cause the wipers `29, 30 and 31 to rub against the sides of their respective contacts, due to the pawl 39 engaging a tooth of the stationary ratchet ftl. The armature 87 of the secondary release magnet SRM now vibrates and the pawl 88 steps the ratchet wheel 91 in a reverse clockwise direction, and the said pawl and the inion 55 being secured to the secondary shaft SS, thesleeve 32 is moved toward the left along the shaft PS, restoring the wipers from their secondary movement. The catch bar 37 which is carried along with wipers,

an armature 87 v again enters the slot 36 of the ratchet wheel and the cam 37 on catch bar 37 engages the pawl 39 moving it out'of engagement with the stationary ratchet l1. The primary release magnet PRM being energized and holding the retaining pawl 48 out of engagement with the ratchet wheel 35, and the pawl 39 now being out of engagement with the ratchet 1, the wipers are restored from their primary movement, due to the spring l5 acting upon the primary shaft PS. The primary off-normal springs POBv and the secondary off-normal springs SON are moved to their normal position upon the restoration of their respective shafts. The energizing current for the release magnets may be cut off in any desirable manner, but I preferably perform this by means of the off-normal springs as described in connection with the circuit diagram;

What I claim as new and desire to secure by Letters Patent is:

1. An electrical switching mechanism, comprising passive contacts arranged in straight line rows, a wiper having a contact end adapted to connect with said contacts, a connected rotatable shaft-and associated driving mechanism therefor whereby said wiper is moved to selecta row,and a second connected rotatable shaft and associated driving mechanisln therefor' whereby said wiper is moved in a straight line to select a contact in a row. i

2.` An electrical switching mechanism comprising passive contacts arranged in straight line rows, a wiper having a contact end adapted to connect with said contacts, a connected rotatable shaft and associated driving mechanism therefor whereby said wiper is moved to select a row, a second connected rotatable shaft and associated driving mechanism therefor whereby said wiper is moved in a straight line to select a contact in a row, and electromagnetic means for restoring said wiper.

3. An electrical switchingmechanism comprising passive contacts arranged in straight line rows, a wiper having a contact end adapted to connect with said contacts, a rotatable shaft, a step-by-step magnet for rotating said shaft to move said wiper to select a row, a second rotatable shaft connected to said wiper, and a second step-bystep magnet for rotating said second shaft to move said wiper in a straight line to select a contact in a row.

4. A selective switch for telephone systems comprising passive contacts arranged in straight line rows, a wiper having a contact end adapted to connect with said contacts, .a rotatable shaft, a ratchet wheel associated with said shaft, an electromagnet for operating said ratchet to move said wiper to select a row, a second rotatable shaft connected with said wiper, and an electromagnet for rotating said second shaft to move said wiper in a straight line to select a contact in a row.

5. A selective switch for telephone systems comprising passive contacts arranged in straight line rows, a wiper for coper` ating` with said contacts. a rotatable shaft, an electromagnet for operating` said shaft whereby` said wiper is given a primary adjustment to select a row, a release magnet for said shaft. a second rotatable shaft, Suit-v able mechanism connecting said second shaft and wiper, an electromagnet for operating said second shaft and connecting mechanism whereby said wiper is given a .so-called straight line secondaryy adjustment to select a contact in a row, a release magnet for said second shaft and means controlled hv said release magnets for restoring their respective associated shafts.

l'. A selective switch for telephone systems comprising passive contacts arranged in rows, a rotatable shaft, a sleeve loosely mounted on said shaft, a wiper secured to .said sleeve for cooperating with said contacts, means for rotating said sleeve to move Asaid wiper to select a row, and means for moving sai-d sleeve along said shaft whereby said wiper selects a contact in a row.

T. An electrical switching mechanism comprising contacts arranged in straight line rows, a single set of movable wipers having contact-ends adapted to engage said contacts, a supl'iorting sleeve for said contact ends, a shaft for said sleeve, an elcctromagnet for moving said shaft, sleeve and contact-ends to select a row, an escapeinent and suitable associated mechanism for controlling the movement of the sleeve and contact ends in a straight line to select a contact of a row. and an electromagnet for operating said escapement.

8. An electrical switching mechanism comprising passive contacts arranged in straight line rows, a single set of movable wipers having contact-ends adapted to engage saidconta-cts, a supporting sleeve for said contact ends, a shaft for said sleeve, an electromagnet for moving said shaft, sleeve and contact ends to select a row, an escapement and suitable associated mechanism for controlling the niovement of the sleeve and contact ends in a straight line to select a contact of a row, an electromagnet for operating said escapement,aiid restoring means for-said wipers.

9. An electrical switching mechanism comprising passive contacts arranged in rows, movable wipers having contact ends adapted to engage said contacts, an electron'iagnet for moving said contact-ends in a primary direction to select a row. an escapement for controlling the secondary movement of the contact ends to select a contact of a row, an electromagnet for operating said escapement, a release magnet for restoring said contact-ends from said secondary movement, and a second release magnet for restoring said contact ends from their primary movement.

10. An electrical switching mechanism comprising passive contacts arranged in rows, wipers adapted to engage said contacts, an electromagnet for giving aprimary movement to said wipers to select a row, a stop for holding said wipers, an electromagnet for giving a secondary 'movement to said wipers to select a contact in the row, a step-by-step release magnet to restore said wipers from said secondary movement and a release magnet for removing said stop, whereby said wipers are restored' from the primary movement.

11. A selective switch for telephone systems comprising passive contacts, a wiper for cooperating with said contacts, a shaft for controlling a movement of said wiper to connect with one of said contacts, an auX- iliary switchy for said selector including passive contacts and a movable contact for cooperating therewith. an electromagnet for moving the said movable contact to connect with one of said associated passive contacts, and means controlled by said shaftfor restoring said movable Contact.

12. A selector switch for telephone' systems, comprising a rotatable shaft, bank contacts arranged in straight rows parallel to and equidistant from the axis of said shaft, a wiper supported by said shaft, means acting upon said shaft for rotating said wiper to select a row, and means for thereafter advancing said wiper independent of said shaft to successively engage the contacts in a row.

13. A selective switch for telephone systems comprising a rotatable shaft, bank contacts arranged in straight rows parallel to and equidistant from .the axisy of said shaft, a sleeve loosely supported by said shaft, a wiper carried by said Sleeve, means for rotating said sleeve and wiper to select a row` and means for thereafter moving said sleeve along sa-id shaft whereby said wiper successively engages the contacts in a row.

14. A selective switch for 'telephone systems comprising a'rotatable shaft, bank Contacts arranged in straight rows parallel to and equidistant from the axis of said shaft, a sleeve loosely supported by said shaft, a wiper secured to said sleeve, an electromagnet for rotating said shaft whereby-said wiper is rotated to select a row, a second electromagnet and associated mechanism for advancing said sleeve along said shaft Whereby said wiper successively engages thecontacts in a row.

1:3. selective switch for ltelephone Systems comprising a rotatable shaft, bank c0ntacts arranged in straight rows parallel to lafl and equidistantyfrom the axis of said shaft, a sleeve loosely supported by said Shaft, a wiper secured to said sleeve, an electromagnet for rotating said shaft whereby said wiper is rotated to select a row., a second electromagnet and associated mechanism for advancing said sleeve along said shaft whereby said wiper successively engages the contacts in a' row, and a pair of electromagnets for controlling the restoration ofsaid wiper from its primary and secondary movements respectively.

16. An electrical switching mechanism comprising a member having rotary and longitudinal movements, a supporting member for said first member, means for rotating said supporting member whereby said first member is rotated, means for longitudinally moving said first member independent of said supporting member, groups of contacts arranged in rows, a wiper carried by Said first member, whereby a row of contacts is selected and thereafter a contact in the row selected.

17. A selector switch for telephone sys-y tems comprising bank contacts arran ed in v straight rows parallel to and equi istant` from a definite axis, a wiper suitablysupported at said axis and adapted to partake of rotary and longitudinal motion, a primary shaft and suitable mechanism for rotating said wiper to select a row, a rota-` table secondary shaft and suitable connecting mechanism for moving said wiper ialong the contacts of the selected row,'and means about the last mentioned operation of the wiper.

18. A selector switch comprising a faceplate having a rectangular orifice therein, a contact bank suitably supported against the back of said plate within the outline of said orifice, a primary shaft supported on he other side of said plate, a sleeve carried by said shaft, a wiper secured to said sleeve and projecting through said orifice into operative relation with said contact bank, a secondary shaft also supported upon the last for rotating said shaft, and means for slid-4 ing said sleeve axially.

20. In an automatic switch, a plurality of rows of contacts, a shaft, a sleeve non-rotatably mounted thereon, a brush carried by lsaid sleeve forI engagement" with said contacts, means for rotating said shaft, and means for sliding said sleeve on said shaft.

21. In an automatic switch, a shaft, a cylindrical terminal bank having'longitudinally extending rows of contacts parallel to said shaft, a sleeve'non-rotatably mounted on said shaft, a brush carried by said sleeve Vfor engagement with said contacts, lmeans for rotating said shaft, and means for sliding said sleeve on said shaft. b

2Q. In an automatic switch, the combination with a cylindrical terminal bank having longitudinally extending straight rows of contacts, vof a support, a brush adapted to cooperate with thevcontactsof said rows mounted on said-support, means for rotating said support to select one vofsaid rows of contacts, a yrotary holding'l means for prefor rotating said secondary sha-ft to bri-ngy venting reverse rotation,`means lfor thereafter moving saidsupport longitudinally, longitudinal holding means, and means for preventing releasingvmovementof the rota'ry holding means untilythe longitudinall return movement is completed.

Signedby me at Chicago, county'of'Cook, and State of Illinois, in the presence vof two lso 

